drm/xe/lnl: Drop force_probe requirement

drm/xe/lnl: Drop force_probe requirement

Lunar Lake has been usable for a while in a desktop setup. Bugs are
sporadically showing up in CI, but being promptly fixed. Nothing very
concerning.

All the uapi changes related to fundamental platform usage have been
finalized.

Remove the force_probe requirement and enable the platform by default.

Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240822224615.793540-1-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>